﻿// Copyright (c) Argo Zhang (argo@163.com). All rights reserved.
// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
// Website: https://www.blazor.zone or https://argozhang.github.io/

using Microsoft.AspNetCore.Components;
using Microsoft.Extensions.Localization;
using Microsoft.JSInterop;
using System;
using System.Collections.Generic;
using System.Diagnostics.CodeAnalysis;
using System.Linq;
using System.Threading.Tasks;

namespace BootstrapBlazor.Components
{
    /// <summary>
    /// Editor 组件基类
    /// </summary>
    public partial class Editor : IDisposable
    {
        /// <summary>
        /// 获得/设置 组件 DOM 实例
        /// </summary>
        private ElementReference EditorElement { get; set; }

        /// <summary>
        /// 获得/设置 JSInterop 实例
        /// </summary>
        private JSInterop<Editor>? Interope { get; set; }

        /// <summary>
        /// 获得 Editor 样式
        /// </summary>
        private string? EditClassString => CssBuilder.Default("editor-body form-control")
            .AddClass("open", IsEditor)
            .Build();

        /// <summary>
        /// 获得/设置 Placeholder 提示消息
        /// </summary>
        [Parameter]
        [NotNull]
        public string? PlaceHolder { get; set; }

        /// <summary>
        /// 获得/设置 是否直接显示为富文本编辑框
        /// </summary>
        [Parameter]
        public bool IsEditor { get; set; }

        /// <summary>
        /// 获得/设置 设置组件高度
        /// </summary>
        [Parameter]
        public int Height { get; set; }

        /// <summary>
        /// 获得/设置 富文本框工具栏工具，默认为空使用默认值
        /// </summary>
        [Parameter]
        [NotNull]
        public IEnumerable<object>? ToolbarItems { get; set; }

        /// <summary>
        /// 获得/设置 自定义按钮
        /// </summary>
        [Parameter]
        [NotNull]
        public IEnumerable<EditorToolbarButton>? CustomerToolbarButtons { get; set; }

        [Inject]
        [NotNull]
        private IStringLocalizer<Editor>? Localizer { get; set; }

        private string? _value;
        private bool _renderValue;
        /// <summary>
        /// 获得/设置 组件值
        /// </summary>
        [Parameter]
        public string? Value
        {
            get { return _value; }
            set
            {
                if (_value != value)
                {
                    _value = value;
                    _renderValue = true;
                }
            }
        }

        /// <summary>
        /// 获得/设置 组件值变化后的回调委托
        /// </summary>
        [Parameter]
        public EventCallback<string?> ValueChanged { get; set; }

        /// <summary>
        /// 获得/设置 组件值变化后的回调委托
        /// </summary>
        [Parameter]
        public Func<string, Task>? OnValueChanged { get; set; }

        /// <summary>
        /// 获取/设置 插件点击时的回调委托
        /// </summary>
        [Parameter]
        public Func<string, Task<string>>? OnClickButton { get; set; }

        /// <summary>
        /// OnInitialized 方法
        /// </summary>
        protected override void OnInitialized()
        {
            base.OnInitialized();

            PlaceHolder ??= Localizer[nameof(PlaceHolder)];

            ToolbarItems ??= new List<object>
            {
                new List<object> { "style", new List<string>() { "style" } },
                new List<object> { "font", new List<string>() { "bold", "underline", "clear" } },
                new List<object> { "fontname", new List<string>() { "fontname"} },
                new List<object> { "color", new List<string>() { "color"} },
                new List<object> { "para", new List<string>() { "ul", "ol", "paragraph"} },
                new List<object> { "table", new List<string>() { "table"} },
                new List<object> { "insert", new List<string>() { "link", "picture", "video" } },
                new List<object> { "view", new List<string>() { "fullscreen", "codeview", "help"} }
            };
            CustomerToolbarButtons ??= Enumerable.Empty<EditorToolbarButton>();
        }

        /// <summary>
        /// OnAfterRenderAsync 方法
        /// </summary>
        /// <param name="firstRender"></param>
        /// <returns></returns>
        protected override async Task OnAfterRenderAsync(bool firstRender)
        {
            await base.OnAfterRenderAsync(firstRender);

            if (firstRender)
            {
                Interope = new JSInterop<Editor>(JSRuntime);
                var methodGetPluginAttrs = "";
                var methodClickPluginItem = "";
                if (CustomerToolbarButtons.Any())
                {
                    methodGetPluginAttrs = nameof(GetPluginAttrs);
                    methodClickPluginItem = nameof(ClickPluginItem);
                }
                await Interope.InvokeVoidAsync(this, EditorElement, "bb_editor", methodGetPluginAttrs, methodClickPluginItem, nameof(Update), Height, Value ?? "");
            }
            else if (_renderValue)
            {
                _renderValue = false;
                await JSRuntime.InvokeVoidAsync(EditorElement, "bb_editor", "code", "", "", "", Height, Value ?? "");
            }
        }

        /// <summary>
        /// Update 方法
        /// </summary>
        /// <param name="value"></param>
        [JSInvokable]
        public async Task Update(string value)
        {
            Value = value;
            if (ValueChanged.HasDelegate)
            {
                await ValueChanged.InvokeAsync(Value);
            }

            if (OnValueChanged != null)
            {
                await OnValueChanged.Invoke(value);
            }

            _renderValue = false;
        }

        /// <summary>
        /// 获取编辑器的 toolbar
        /// </summary>
        /// <returns>toolbar</returns>
        [JSInvokable]
        public Task<List<object>> GetToolBar()
        {
            var list = new List<object>(50);
            list.AddRange(ToolbarItems);

            var itemList = new List<object>
            {
                "custom",
                CustomerToolbarButtons.Select(p => p.ButtonName).ToList()
            };
            list.Add(itemList);

            return Task.FromResult(list);
        }

        /// <summary>
        /// 获取插件信息
        /// </summary>
        /// <returns></returns>
        [JSInvokable]
        public Task<IEnumerable<EditorToolbarButton>> GetPluginAttrs()
        {
            return Task.FromResult(CustomerToolbarButtons);
        }

        /// <summary>
        /// 插件点击事件
        /// </summary>
        /// <param name="pluginItemName">插件名</param>
        /// <returns>插件回调的文本</returns>
        [JSInvokable]
        public async Task<string> ClickPluginItem(string pluginItemName)
        {
            var ret = "";
            if (OnClickButton != null)
            {
                ret = await OnClickButton(pluginItemName);
            }
            return ret;
        }

        /// <summary>
        /// Dispose 方法
        /// </summary>
        /// <param name="disposing"></param>
        protected virtual void Dispose(bool disposing)
        {
            if (disposing)
            {
                Interope?.Dispose();
                Interope = null;
            }
        }

        /// <summary>
        /// Dispose 方法
        /// </summary>
        public void Dispose()
        {
            Dispose(disposing: true);
            GC.SuppressFinalize(this);
        }
    }
}
